Test Equipment

Brooke Clarke, N6GCE

HP Agilent Serial Numbers to Year
Tests on Radios
General Bench Test Equipment
    DC Power Supplies
DC Voltage Reference
    Meters - F87
          Transistor Testers 
    HP 59000 Series HP-IB Accessory Modules
Table of Mil Test Equipment


When the manual for a military radio is written the equipment listed for bench test is what was standard issue at the time.  To run the same test today you can substitute more modern equipment as long as the newer equipment has equal or better specs.

HP Agilent Serial Numbers

For serial numbers in the format iijjAnnnn adding 60 to ii is the year made, jj is the week, the letter is the country where made.
for example 1848J02842
The series prefix doesn't represent the date of manufacture.  Instead, it represents the date of the last production change that affects form, fit, or function, or for other modifications such as firmware version changes. We use the series prefix to tie production changes (changes in production documentation) to changes in customer documentation.

Tests on Radios

Because of the FM capture effect the way receiver sensivity is measured must be different for FM and AM radios.  AM radios have no capture effect.

SINAD FM receiver sensivity

This is an acronym for "SIgnal Noise And Distortion".  It's defined as:
SINAD = 20 * LOG((RMS Value of Signal, Noise and Distortion)/(RMS Value of Noise & Distortion))

The inclusion of noise and distortion with the signal is the way a distortion analyzer works, i.e. it measures everything then notches out the test tone.  The prior signal to noise ratio was difficult to measure because it required a spectrum analyzer to measure the signal all by itself.

I think the values used for SINAD when the HP 300 series analog distortion meters were popular was 10 dB.  But these meters used a average reading AC voltage detection method that was in error about 2 dB for non sine signals.  With the introduction of the 8903 and other true RMS reading distortion analyzers the spec was changed to 12 dB to produce about the same sensitivity readings as the prior analog instruments.  (The 8903 has an internal jumper option to connect an average reading detector if compatibility with the older 300 series instruments is needed).

The common modern definition of receiver sensitivity is the power level that produces a 12 dB SINAD.

The idea is that there are two factors contributing to the received audio signal to noise ratio in an FM receiver.  First as the signal strength increases from the noise level the audio output gets quieter (this is even when there is no modulation on the carrier).  Second as the signal strength with modulation increases from the noise a 1 kHz tone will get stronger.  The difference between the true RMS audio output with the tone modulation on and the true RMS audio output with the tone modulation off is the SINAD.

Distortion Analyzer

One way to measure this in a single step is to use a SINAD meter or a Total Harmonic Distortion (THD) meter.  Both of these methods notch out the 1 kHz tone and can measure both the tone and what's left.  The advantage of this method is that you don't need to turn the 1 kHz modulation on and off.  This would be very good when testing the SINAD in the field from a transmitter at a remote fixed point.

By using a real SINAD meter like the HP 8903B/E Audio Analyzer the transmitter can be sending a constant 1 kHz tone and the meter will notch out the tone and report the SINAD.  This would allow drive testing using GPS in the mobile unit or using a time log to allow plotting SINAD vs. position of the mobile unit.  Note for receiver testing the "E"  version (no audio gen, just the meter) of the 8903 is about 1/2 the price of the "B" version (internal audio gen).

True RMS Voltmeter

Another way to measure SINAD is to just turn on and off the modulation (note the carrier is left on all the time).  This has the advantage that you only need a true RMS voltmeter instead of the SINAD meter or a THD meter like the TS-723 (HP 330 series) distortion Analyzer.  I am using this method with the HP/Agilent 8648A signal generator and HP/Agilent 34401A Multimeter under computer control so that a plot can be made of both the plain AF noise output, the 1 kHz tone output, and the SINAD.  The problem with this is the requirement to turn on and off the modulation.  Easy to do on the bench but more difficult when a mobile unit is driving.

The Distortion Analyzer, THD and SINAD - college experiment that gives the equations and explanation of SINAD
FM Modulation Tutorial -

Receive Audio Frequency Response

By using a signal generator like the HP/Agilent 8648A with option 1EP and a voltmeter like the HP/Agilent 34401A a plot of the audio frequency response can be made.  It's interesting that the PRC-25 has a peaky response centered at 300 Hz but the PRC-126 has a fairly flat response from 100 to about 9,000 Hz.  This is probably because the PRC-126 was designed to support voice encryption over an even wider audio bandwidth and the SPKR audio has been low pass filtered to improve the s/n for clear voice.

This plot was used in a before and after manner when the PRC-25 was upgraded to the PRC-25B to support multiple channel telephony.

Transmit Output

There are a number of parameters to look at on the transmitted signal:


Can be measured with a power meter like the PRM-34 or similar meters.


Can be measured with a filed test meter like the PRM-34 or a modern spectrum analyzer like the Agilent 4395A.  When the transmit output frequency is not known the spectrum analyzer is a great tool to find the frequency.

FM Deviation

Can be measured with a deviation meter like the ME-505 or ME-525 but can also be measured directly on the Agilent 4395A or other spectrum analyzer.  The HP 8901 Modulation Analyzer is a modern version of the ME-505/525.

Harmonic and Spurious outputs

The spectrum analyzer makes this an easy test but it could also be done using a receiver, but finding spurious outputs with a receiver is very tedious unless a computer can do a spectrum sweep.

General Bench Test Equipment

This paragraph is for equipment that I either have now or have used.  Since I do LabVIEW programming, instruments with IEEE-488() and/or RS-232 so that they can be computer controlled are a plus for me.  You can get a lot more out of an instrument when a computer is in control vs. manual operation.


DC Power Supplies

Volts @ Amps
200 @ 17
20 @ 120
60 @ 50
20 @ 30
500 @ 5
60 @ 10

There are a number of supplies in the 663x series, all are 100 Watts, but they have different max voltages and currents.  A key feature for me is that it's a two quadrent supply, i.e. it can source and sink power.  You can charge a battery and then discharge it just by changing the sign of the dirve.
HP-IB and remote sensing.
The metering has ten times the resolution of the E3617A.

Minor complaints: no back light in display and fan on all the time.

Out 1
Out 2
Out 3
Out 4
80W LV
80W LV
80W HV
80W HV
40W LV
80W LV
40W HV
40W LV
80W LV
40W HV
40W HV
40W HV
40W HV
40W HV
40W HV

Low Range
Hi Range
80W LV 7V @ 10A
20V @ 4A
80W HV 20V @ 4A
50V @ 2A
40W LV 7V @ 5A
20V @ 2A
40W HV 20V @ 2A
50V @ 0.8A

Note that you can parallel like outputs.
Voltage (V)
Currernt (A)
0 to +6 V @ 2.5 A
0 to +20 V @ 0.5A
0 to -20 V @ 0.5 A
HP 6236A Triple
                  Output Power Supply
This was purchased very used to replace the HP E3631A Triple Output Digital Power Supply.  The problem with the E3631A is that after a power failure it defaults to all three outputs at zero volts.

The 6236A uses front panel knobs to set the voltage and so comes up from a power failure at the set voltages (+5, +12 and -12 in this case).

Note:  There are only two voltage adjust knobs.  One for the 0-6 Volt supply and the other controls both polarities of the 0-20 Volt outputs.  But there are seperate metering switch positions for each of the three supplies.
when connected to the Thunderbolt GPS receiver,
both the +12 and -12  were at zero and the 5V was low.
C33 s.b. 490 uF @ 85V tests at 54 Ohms ESR & 0.53 uF so is bad.  When removed it tests as an open.  It's across the +7.5V rail, maybe why the +5 output has limited range.
Since this supply also poweres the op amps and reference voltages it may be the only problem.  Caps on order 21 Feb 2011.
HP 6236A C33 Date Code 7626L i.e. it's 35 years old
The vent (hole in center on right) is intact, i.e. it has not blown.
Test open for DC and capacitance.
HP 6236A C33

Agilent E3617A 0-60 V 0-1A single range digital readouts but 10T analog controls for Voltage and Current.  4 times the power (and size) of the HP 6216A.  But no computer interface, it's a linear supply that can be externally controlled with the old HP programming box.  The Voltage display reads to 0.01 Volts (i.e.. 10 mV, but it is not that accurate according to my Fluke 86 DMM in 6 digit mode.  Current display resolution to 1 mA, but have not checked it.

V @ A
8 @ 3 or
15 @ 2
20 @ 1.5 or
35 @ 0.85
E3612A 30
60 @ 0.5 or
120 @ 0.25

E3614A 48
8 @ 6
E3615A 60
20 @ 3
E3616A 60
35 @ 1.7
HP E3617A Power
This is my most used power supply.
60 @ 1
E3620A 50
25 @ 1 and
25 @ 1
6 @ 2.5 and
+20 @ 0.5 and
-20 @ 0.5

Not suitable for long term use.
It resets when the power fails.
6 @ 5 and
+25 @ 1 and
-25 @ 1
15 @ 7 or
30 @ 4
8 @ 20 or
20 @ 10
25 @ 7 or
50 @ 4
8 @ 3 or
20 @ 1.5
E3641A 30
35 @ 0.8 or
60 @ 0.5
E3642A 50
8 @ 5 or
20 @ 2.5
E3643A 50
35 @ 1.4 or
60 @ 0.8
E3644A 80
8 @ 8 or
20 @ 4
E3645A 80
35 @ 2.2 or
60 @ 1.3
E3646A 60
2X 8 @ 3 or
2X 20 @ 1.5
E3647A 60
2X 35 @ 0.8 or
2X 60 @ 0.5
E3649A 100
2X 35 @ 1.4 or
60 @ 0.8

Mesa Power Systems Model 10199 Power Supply Aircraft

My hope was that this would contain a 400 Hz 3-phase supply, but instead it has a number of DC power supplies.
Note aircraft "14 Volts" is exactly the same a ground vehicle "12 Volts" just as aircraft "28 Volts" is the same as ground vehicle "24 Volts".
These power supplies are set for the upper end of the range for each voltage (12V = 10 to 15 and 24V = 20 to 30).

28 (30V ?)

I'm going to remove each supply and use No. 2 and 4 by connecting "12 Volt" Power pole connectors.  Note "12 Volts" means 10 to 15 Volts so these are perfect.
No. 1 will have a "24 Volt" power pole connector added.  No. 3 will go on the shelf.

Mesa Power Systems Model 10199 Power Supply
Front panel only has circuit breaker and pilot lamp
Top View with numbers for each power supply
Mesa Power
                  Systems Model 10199 Power Supply Aircraft

Topward 33010D  0-30V, 0-10A.

Switching Mode Power Supply Modules

On eBay you can buy ready made printed circuit boards with a SMPS circuit.
Note: a SMPS can be thought of as a transformer for DC.
If you look at the voltage x current at the input it's about the same as a voltage x current at the output.
While in operation the output power as a fraction of the input power (efficiency) is  typically in the mid 90% range.

DSN2596 based on LM2596

40/4 VDC input, 35/1.3 VDC adjustable output step down only.
DSN2596 based on LM2596

DC Voltage Reference

Precision Voltage Reference 5V .01% Accuracy Calibrator

 is the eBay title.  From Malone Electronics, WA.

Malone 5 Volt
        ReferenceCalibrated using an HP 34401.  Very low cost ($27.50).
The data sheet that came with it said 5.00005 at turn on and 5.00021 after 15 minute warm up.
You can see I'm getting 5.00012.

The more accurate Geller SVR Voltage reference is on order.

The Linear Technology LTZ1000 - this is what's used in the HP3458 and other high end equipment as a voltage reference.  There are some patents about improving it's operation:
4217651 Electrical Measurements, John R. Pickering, Aug 12, 1980, - using a computer to characterize the uncertainty of a voltmeter
5369245 Method and apparatus for conditioning an electronic component having a Characteristic Subject to Variation with Temperature, John R. Pickering, Nov 29, 1994, 219/209; 257/467; 323/907; 324/224; 327/513; 327/538; 438/466; 438/795 - sort of like annealing metal
6342780 Zener diode reference voltage standards, John Robert Pickering, 29 Jan 2002, 23/313; 323/901 - pulsing used to control temperature
2654066 Q Meter, Rosenbaum, 5 Nov 1951, 324/653
2413389 Aditive Multirange Electronic Measuring Instrument, Smith, 31 Dec 1946, 324/115 ; 324/123R - Q meter
2602838  Electrical Measuring Instrument, Boisblanc, 8 July 1952, 324/658 ; 324/619; 324/653 - material testing
Extech 380950 AC/DC Clamp MeterThis 4000 count meter has the ability to work for DC amps which is the key thing I got it for.  The lowest DC Amp range is 4.000 A full scale.  To use the range after powr on and waiting a little for the meter to stablize press the ZERO button.  Then connect to the wire carrying the current.

Note that for small DC currents you can put multiple turns of wire in the 0.49" ID hole and divide the displayed current by the number of wires going through the hole.  With 10 turns the full scale range changes to 0.4000 Amps.

In addition to the AC and DC clamp Amp ranges the meter also supports:
VAC & VDC using the supplied test probes, Resistance, Continuity (but slow), diode test, capactance, Frequency or Duty Cycle and Analog Amp output (10 mV/A) to a scope or DMM.

Powered from two AAA batteries under cover with two (+) screws.

The manual is both English (shown) and Spanish (from back cover), to so reduce it's size I cut off the Spanish half.

This is THE DMM to have.  Got it because the OFF switch on my Fluke 87 (first version) DMM does not always turn it off, so the battery goes dead.
The 87V is the standard of comparison at EEVBlog by David L. Jones.

Transistor Testers

Heathkit IT-10 Transistor-Diode Tester - simple way to ID diode and transistor polarity and get a rough idea of beta.  The IT-27 may be the same tester with different color paint.

This tester is very simple and seems to be very reliable.

You get some idea of relative beta.
Heathkit IT-10
                  Transistor Tester

Heathkit IT-121 Transistor & FET Tester
Uses a couple of "D" batteries and a 100 uA meter movement to test Beta, gm, and a number of leakage currents.
Needed some contact cleaner in the switches and pots (was used by a heavy smoker).  The 166 Ohm cal resistor is supposed to be taped to the inside of the front panel (it's used for setting the pot on the PCB, but if not you can make one by connecting two 100 ohm resistors in series then connecting that 200 ohm resistor in parallel with a 1000 ohm resistor.
Front Panel
IT-121 Front
Back Instructions
IT-121 Back Instructions
IT-121 Inside

GE Transistor Manual "Safe and Simple Transistor Tester'.  Made this for work when we were buying Ge microwave transistors and characterizing them ourselves rather than pay TI a lot extra to sort them.  The 150 Ohm cal resistor is built in on S4 so to do the full scale cal just press BATT TEST and S3.
You can get numbers for beta, and a number of leakage currents.
GE Transistor

  TS-1836C/U - Military in and out of circuit tester also tests FETs and diodes.  Uses self rectification of square wave input to generate a DC output when xixtor is in a common base configuration.

So far not very useful.

TL-120 - rechargable battery powered tester, automatic detection of NPN or PNP, no setttings or meters, just LEDs for PNP, NPN & Fail LEDs.  NSN 6625-00-367-9323 patent 3870953  In-Circuit Electronic Component Tester  324/72.5; 324/537 made by Testline.  Uses a single probe that has three plunger type pointed tips so you can contact all three transistor PCB pads with one hand.  Handy probe and quick check. Trendline R-120 In-Circuit Transistor Tester

This Electronic Goldmine tester uses a 555 oscillator driving a Flip Flop to act as a DPDT switch reversing the polarity to a common emitter configuration.  By noting which of two LEDs turns on you can tell the polarity of a transistor.  But you need to which terminals are the Emitter, Base and Collector. 

Not too useful.
The schematic diagram for this kit should win an award for the most convoluted, upside down and twisted schematic
 possible for such a simple circuit.
                  Goldmine Xixtor Tester

M3 Semiconductor Analyzer
This is the most advanced unit for the price.  Although there are a number of things I'd do to improve it. 

There are three test leads, each of which is fed using a series resistor that's selectable (100k, 10k, 1k or 100 Ohms) and that resistor can be connected to either +5 or ground.  There's a DC voltmeter on each lead.  So by driving the leads two at a time and subtracting voltages you can find the voltage across the DUT.  Also since the voltmeters are after the series resistors you can also find the current at each lead.

I'm having a problem with calibration.  It may be that I've just got some high resistance mux chips (M3 is sending 3 more chips at no charge, good support).  It turns out that if there's solder flux left on the board it can allow leakage to the high impedance voltmeter inputs.  Radio Shack no longer carries flux cleaner, so it's not available in my small town.   Isopopropal alcohol did not work.  But acetone did work.
The problem was poor solder joints caused by using a fine tip soldering iron on a PCB with 2 ounce copper.  You MUST use a high wattage soldering iron in order to heat this PCB.

Note you can see that the solder is not shiny, it's dull when inadaquate heat is used.

The neat thing about it is that it not only figures out which lead is which for transistors, FETs, etc. but it also shows some variable parameters like Vbe, HFE, whether it's a PNP or NPN, or N-JFET or P-JFET, etc.  The display cycles automatically which may be good for an experienced user, but I'd  rather have a "next" button to make writing down the answers easier.

It's great for sorting out grab bags of 3 leaded devices.  I'm planning on adding a machined pin IC socket cut down to 3 terminals in addition to some nice E-Z-Hook grabbers to replace the cheezy ones that come with the kit.

M3 semi Ana

Atlas DCA - Semiconductor Analyser  - looks to be a very similar to the Me above

Shenzhen DY294 Digital Transistor DC Parameter Tester

This unit runs from 6 VDC, either 4 internal AA cells (although the battery compartment can hold 6 cells, but two positions have no electrical contacts) or using a female plug wall wart.

It can test transistors for: VBR, VCEsat, hFE, Iceo.  3-terminal voltage regulators with 27 Volts input.
Withstanding voltage on electrolytic caps up to 1000+ VDC.  This tester has a current limited high voltage supply that is activated when the TEST buttom is pressed (the red LED warning lights when high voltage is present).  When measuring the forward voltage drop on a semiconductor at 800 mA or 2 A the external 6 V @ >=2A power supply should be used.
Shenzhen DY294
                  Digital Transistor DC Parameter Tester

Professional Type Semiconductor Analyzers

I wrote many HP Basic programs to dirve the HP semiconductor analyzer boxes like the 4142 & 4145 DC box and the related LCR meters.

Transistor - L/C ESR Tester

Shown measuring a 470 uF 10 V cap as 482.6 uF & ESR=.01
The ESR-micro V4.0 measures it as       498   uF & ESR= .05

Also has provision for SMT parts.  If the SMT LED was removed it might also be used to test LEDs?
DUT needs to be able to fit into socket eliminating things with fat leads.

Transistor LCESR Tester

LC100-A L/C Tester

This tester is limited to testing inductors or capacitors, but it does that better than the more general purpose testers.
Powered by either a Mini-USB cable (included) or a Wall Wart supplying 5 VDC (not included).

Comes with short test leads that are connected to screw terminals.

Pushing the red button at the lower right displays the test frequency (which changes with component value because this tester works be resonating the DUT with a component that's part of the tester.

May be a knockoff of the AADE L/C Meter.

Note (Up/Down) the White (/HiC), Blue (/HiL) and yellow (C/L) buttons are latching.

LC100-A L/C Tester

Fluke 87 (or any DMM with a diode test) can be used to check for the Base-Emitter and Base-Collector junctions of a transistor.  This is a very powerful method that's also simple.  But it's more time consuming than more advanced test methods. In diode test mode the red lead is positive and the test current is 1 ma (this is a very good way to do this since the Vf of most dioeds is specified at 1 ma).  If a transistor tests as two forward diodes with the red lead common then the transisotr is an NPN but of the black lead is common then it's a PNP.

Most silicon PN junctions have a Vf of about 0.6 volts.  Silicon Schottky junctions range over 0.28 to 0.35 depending on the barrier metal.  Germanium is more like 0.4 volts.

The 87 is the first piece of test equipment that I use.  If you're going to only have one test instrument this is it.  The only time it failed me was when checking a lawn sprinkler system and the 87 showed voltage at the valve but the valve was not activating.  The Fluke 12 showed no voltage in the "V-check" where the input impedance is 1 k ohm.
Fluke 87 DMM
                  in Doide mode

Transistor Test Set Related Patents

Class 324/768 Electricity Measuring & Testing/Subclass 537 indent level is 1 (537) Of individual circuit component or elementSubclass 768 indent level is 4 Bipolar transistor(768)

2847645 Null Type Transisotr Alpha Measuring Set, Thomas  (Bell labs), 12 Aug 1958
2899642 Transistor Test Set, Hussey, 11 Aug, 1959 324/768 - very simple battery powered appha & Ic tester, very much like the Heath IT-10.
2909730 Transistor Gain-Bandwidth Test Circuit, Timm, 20 Oct 1959 324/768 - sweep gen & Scope
3054948 High Frequency Mesurements, Rymaszewski, 18 Sep, 1962 324/629; 324/158.1; 324/615; 324/639; 324/647; 324/650; 333/225
3056924 Null Type Transistor Beta Measuring Set, Thomas (Bell labs), 2 Oct 1962 - prior methods used b=a/(1-a)
3076140 Transistor Test Set, Smith, 29 Jan 1963 - Curve Tracer with stepped base currents
3201690 Wave Transient Time Interval Measuring Circuit with Wave Comparison Function, Embree (Bell labs), 17 Aug 1965 - sub ns
3237104 Pass Fail Transistor Tester for Indicating the combined result of BVceo and Spurious Oscillations, Merkel, 22 Feb 1966 -
3314008 Circuit Empolying Calibrated Variable Impedances for MEasuring Transistor Beta and Beta Cutoff Frequency, Heard, 11 Apr 1967 -

Because of the difficulty in measuring transistor "h" parameters (defined under conditions requiring a short or open) HP came out with the 8410 network analyzer that terminated the input and output of the transistor in 50 Ohms and thus got around the oscillation problems caused by the opens and shorts.  S-parameters were measured and used in design.

HP 59000 Series HP-IB Accessory Modules - seperate web page

Table of Mil Test Equipment

These are instruments that show up in the military radio manuals but that I don't have.  Just for info. 
Mil Nomenclature
Commercial Nomenclature
Key Spec(s)
Tek 7603N11S
TM 11-6625-1703-24P
HP 180+
PL-1186A  PL1187A
Tek 465M
115/230 or 
24 VDC Batt
 TM 11-1214
TM 11-6625-252-20
 TM 11-6625-640-24P
TB 9-6625-342-35
solid state
Tek 531?
Sig Gen
AUL 6201B
TM 11-6625-2952-24P
3.8 - 7.6 GHz
Sig Gen
 TB 11-6625-586-12/1
18 - 80 MHz FM
2 tone IF Sig Gen
 497.5, 498.5, 501.5, or 502.5 KHz
2 tone Ref Sig Gen
2, 3.6, 4, 14.4, 16, 28.8 MHz
Sig Gen
 TM 11-5551B
TM 11-6625-278-20P
TM 11-6625-603-40P
10 KHz to 50 MHz AM
Sig Gen
4 to 405 MHz AM-CW-Pulse
Sig Gen
Wavetek 3001
TM 11-6625-2952-24P
TM 11-6625-3029-14,-24P
TM 11-6625-3051-12, -24P, -40
TB 9-6625-2094-35

Sig Gen
P TM 11-6625-2954-14&
TM 11-6625-2954-24P
50 kHz - 80 MHz
Sig Gen
TM 11-6625-586-12,
-12/1, -24P, -45
HP 8350B
TB 9-6625-2124-35

Digital Counter

TM 11-6625-700-10
-14-1, -25, -24P

HP 5245L
TM 11-6625-1682-24P

Digital Counter
HP 5328
TM 11-6625-2941-14&P
TM 11-6625-2701-35
TB 9-9925-2334-35

Sig Gen
HP 8640B-323
500 KHz to 512 MHz AM-FM-Pulse
Sig Gen
TM 11-5091
HP 616B
1.8 - 4.2 GHz
Sig Gen
3.8-7.5 GHz
Time Mark Gen
Ballantine 6130A
Spectrum Analyzer
10 MHz to 44.88 GHz 
AC-DC Voltmeter
20 Hz to 100 MHz
1 to 300 V fs
to 15 kV
Diff DV VM
Fluke 896A
1 kV
0-10-100-1000 VDC
Multi Meter
6-PXB1  1.3 V
2 AA + 1 C
2.5 V - 5 KV
0.25 - 10 A DC
1K - 10 M Ohm

HP 3478
TM 11-6625-3071-14

Volt - Ohm
 TM 11-6625-203-12,
-24P, -35
2 ea. AA
22.5 V?
1 - 1000 V AC/DC
2k - 20 M Ohm
30 Hz-10KHz
Audio Osc
 TM 11-6625-683-14, -24P
TB 9-6625-1998-35
solid state
20 Hz to 200 KHz

Audio Osc
HP 202C
TM 11-6625-589-15

Dmy Ld &
Watt Mtr
0.2 to 20 MHz
2 to 100 W
 TS-3329/U    HP 236A
TM  11-6625-2903-14&P
Power Meter
30 to 600 MHz
50 and 150 W ranges
SWR Meter
TM 11-6625-333-15, -24P
TM 11-809-20, -35
up to 30 MHz
600 W
Watt Meter
2 to 1000 MHz
10 to 1000 W
Dmy Ld
TM 11-6625-446-15
2 to 1000 MHz
10 to 1000 W
Watt Meter
 M 11-6625-595-34
50-600 MHz
120 W
Dummy Load
600 to 1850 MHz
40 W
Dummy Load
30 MHz
800 W
DC Bridge
TM 11-2019
TM 11-6625-249-12P, -34P
TB 9-6625-388-35
3 each D
 no active devices
1 ohm to 1,011 M Ohm
AC Bridge
Navships 91704A
TM 11-5511
TM 11-6625-239-12, -34P
TM 11-6625-524-14 
HP 410
TM 11-6625-200-12,
-15, -24P, -35
TM 11-6625-366-10,
-15, -24P
Spectrum Analyzer
TM 11-6625-255-14, 
-24P, -34P
HP 330x Distortion Ana
Modulation Meter
TM 11-6625-3017-14
TF 2300A

Modulation Meter
TM 11-6625-3059-10

Modulation Meter
TM 11-6625-400-20P, -35, -40
TM 11-6625-2629-14&P, -24P
TB 9-6625-2004-35
tube type

Sig Gen
HP 608
Distortion Analyzer
HP 333A

Distortion Analyzer
Tek DA 4084 ?
NSN 6625-01-217-0054
TM 11-6625-3152-14

Tek 1502
TM 9-4935-601-14-3&P 115AC/230AC/12DC

1 to 2,000 feet of line

HP 530x Counter
TB 9-6625-2215-35


HP 5233L Counter
TM 11-6760-242-24P


Online Museum and Technical History of Hewlett-Packard (now Agilent Technologies) Electronic Test Equipment - by Ken Kuhn
Heathkit Test Equipment -  Summary Table w/ Links

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