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PM 6666
Programmable Timer / Counter
Technical Data
PM 6669 Frequency Counter
•Unrivaled price/performance
•160 MHz / 1.3 GHz option
•Reciprocal counting, 7 digits per second
•High stability MTCXO: 2x10-7 over 0°C to 50°C with push-button calibration
•Error-free triggering-, high noise immunity input circuitry
•PM 6666: Full GPIB/IEEE 488 programmability, Auto trigger, Voltage measurements
•PM 6669 Ease of operation, auto triggering, auto range and auto display
•Rugged, no compromise quality, MTBF 50.000h & 70.000h
•Excellent suppression of RF interference through all-metal cabinet
•Optional battery for field use
The PM6666 and PM6669 are economical, easy-to-use counters that meet the demands for high-precision measurements, reliability and durability. The units use reciprocal frequency counting, which yields high resolution measuring results under all conditions, even on low frequency measurements. The high performance counter frontends, providing variable sensitivity and noise immunity increase measuring accuracy. Accuracy can be further improved with the optional high stability MTCXO TimeBase, that offers a stability of
2 x 10-7 (0°C to 50°C), comparable to that of an oven stabilized oscillator. The counters have high input protection, allowing it to withstand inputs of 12V rms on the optional
50Ω RF input and 350V (dc+ac peak) on the 1 MΩ LF input.
PM 6669 Frequency Counter
The multi-function PM 6669 offers next to frequency measurements also period, count totalization, ratios, pulsewidth and frequency difference measurements, functions normally found only in more expensive timer / counters. This counter can be used on the test bench or for field service. It has a full
9-digit display, to allow complete presentation of measuring results. When less accurate measurements are made, blanking of irrelevant display digits makes it easy to read results.
PM 6666 Programmable Timer/ Counter
The PM 6666 is a low cost timer/counter with high accuracy frequency, time and voltage measurements that also offers 100% programmability including trigger level and sensitivity settings. A bus learn mode is provided to speed and simplify programming. The PM 6666 is also a bench-top use; with 9 front panel selectable measuring functions including voltage max. /min. measurements.
Error-Free Triggering
Triggering is error-free on the PM 6666 for all waveforms.
Trigger level setting can be automatic on all input signals over 100 Hz. Resolution is 20/200 mV, over a very wide range (-50V to +50V) that allows measurements to be accurate even on high voltage events. The trigger level can be displayed immediately with one keystroke; and inputs can be instantly checked for triggering with the Tri-state LED trigger indicators. To give the various noise immunity settings, input sensitivity has six steps, from 20 mV to 1V rms.
V pp measurements up to
50 MHz
The PM 6666 has Volt peak measurements up to 50 MHz. When displaying Vmax. / min. measurements, positive and negative signal peaks of the input signal are shown simultaneously with a resolution of 20 or 200 mV.
High Resolution
The PM 6666 can measure low frequency signals to high resolution with synchronized multiple period measurements and computing the reciprocal values. Resolution is at least 7 digits on a 1s measuring time, because the traditional ± 1 input cycle error is eliminated. Time interval measurements are high resolution
Selection Table |
PM 6666 timer/counter |
PM 6669 frequency counter |
Freq. A |
0.1 Hz to 160 MHz |
10 Hz to 160 MHz |
Freq. B via GPIB |
0.1 Hz to 16 MHz |
|
RF Freq. option |
70 MHz to 1.3 GHz (Chan. C) |
70 MHz to 1.3 GHz (Chan B) |
Measuring Modes |
Freq. A, B, C (RF) |
Freq. A, B (RF) |
|
Time Interval A-B, Period A |
Pulse width A, Period A, RPM A |
|
Ratio A/B, Ratio B/A, C/A, C/B (GPIB) |
Freq. A/A0, Freq. A-A0 |
|
Totalize A |
Totalize A |
|
Volt max. /min. A |
|
Resolution |
7 digits/s (frequency) |
7 digits/s (frequency) |
|
100 ns (time interval single, period), |
|
|
≥ 30 ps time interval averaged |
|
Measuring times |
0.2, 1, 10s and SINGLE |
0.2, 1, 10s and SINGLE |
Sensitivity LF, RF |
20, 10 mV |
10, 10 mV |
Sensitivity setting, range |
6 steps, x1 ... x50 |
x1 to x400, cont. variable |
Trigger level |
AUTO, Manual, GPIB |
AUTO, Manually set (+, 0, -) |
Input attenuation |
x1 x10 AUTO |
|
GPIB interface |
Full programmable |
All front panel settings |
External Reference input |
10 MHz |
10 MHz |
Noise suppression filter |
- |
50 kHz low pass |
Other facilities |
- |
Display hold, Reset, Digit blanking |
Options |
MTCXO time base, 1.3 GHz RF input, GPIB interface, Rack mount, Battery pack, Carrying case |
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as well as high accuracy, due to the time interval averaging technique. The 100 ns resolution is improved by a factor vN
(N = number of time intervals averaged) when compared with single time interval measurements.
MTCXO Time Base
(Mathematically Temperature Compensated Crystal Oscillator) Counter stability and precision is ultimately determined by the time-base oscillator. This can be further improved with the optional high stability MTCXO time-base that offers a stability, comparable to that of an oven stabilized oscillator, but at much lower cost. The temperature dependency curve for each individual crystal oscillator is factory-measured, and the frequency deviations ( f) across the temperature range are stored in a non-volatile memory. During operation, the f value for the operating temperature is referenced in memory and used to compensate the measuring result before it is displayed. This automatic temperature compensation also results in highly accurate measurements instantly, without long warm-up times. The unique MTCXO principle gives a residual temperature stability of 2 x 10-7 over the temperature range 0 °C to 50°C.
Specifications PM6666
Measuring Modes
Freq. A, Freq. B, Freq. C, Period A, Ratio A/B,
(Ratio B/A & C/A & C/B via GPIB), Totalize A, Time Interval A-B, Volt Max./Min. A.
Frequency A or C
(Frequency B via GPIB only) Freq. A: 0.1 Hz to 160 MHz
(120 MHz to 160 MHz with limited temperature range;
typ. +23 °C ± 5°C)
Freq. B: 0.1 Hz to 16 MHz (only via GPIB)
Freq. C: 70 MHz to 1.3 GHz (option)
Mode: Reciprocal freq. counting.
LSD displayed:
2.5 x 10-7x FREQ / Measuring time
Period A
Range: 8 ns to 2 x 108 s
Mode: Single period measurement (SINGLE) or period average measurement
(at 0.2, 1 or 10 s measuringtimes).
LSD displayed:
SINGLE period measurement:
-(TIME < 100 s): 100 ns
-(TIME > 100 s): 5 x PERIOD / 109 s
Period average measurement:
- 2.5 x 10-7 x PERIOD / meas. time
Ratio A/B
(Ratio B/A, C/A or C/B via GPIB only)
Range:
0 and 1 x 10-7 to 2 x 109 (A/B) 0 and 1 x 10-8 to 2 x 108 (B/A)
0 to 1 x 1015 (A/B SINGLE and B/A SINGLE), 8 to 6 x 1010 (C/B) (C/A)
Frequency range:
Input A: 0.1 Hz to 160 MHz (A/B) (120 MHz to 160 MHz with limited temperature range; typ. +23 °C
± 5 °C)
0 Hz to 16 MHz (B/A, C/A, A/B SINGLE)
Input B: 0 Hz to 16 MHz Input C: 70 MHz to 1.3 GHz (option PM 9608B)
LSD displayed (Ratio A/B):
25 / meas. time x FREQ B
(0.2, 1 or 10 s Measuring times)
LSD displayed (Ratio B/A):
2.5 / meas. time x FREQ A) (0.2, 1 or 10 s Measuring times)
LSD displayed
(A/B SINGLE, B/A SINGLE):
(RATIO < 109 ): 1
(RATIO > 109 ): 5 x RATIO / 109
LSD displayed (Ratio C/A or C/B):
640 / meas. time x FREQ A or B
Time interval A-B
(Time interval B-A via GPIB only)
Range:
100 ns to 2 x 108 s (SINGLE)
0 ns to 20 s (average) Mode: Single time interval
(SINGLE) for time interval average measurements (at 0.2, 1 or 10 s measuring-times).
LSD displayed:
SINGLE Time interval measurement:
(TIME < 100 s): 100 ns
(TIME > 100 s): 5 x TIME / 109 s Time interval average measurement:
2.5 x 10-7s / N
Number of Intervals averaged N:
Measuring time / pulse repetition rate.
Min dead time from stop to start: 250 ns
Timing difference A-B channels:
4 ns max.
Note: Input signals must be repetitive and
asynchronous with respect to the time base.
Totalize A
(Totalize B via GPIB only)
Range:
0 to 1 x 1015 with indication of k or M (kilo-pulses or Mega-pulses) the result is truncated if out of display range.
Frequency range: 0 Hz to 16 MHz
Pulse pair resolution: 80 ns
LSD displayed:
1 unit count (counts < 109)
5 x counts / 109 (counts > 109)
Gated by B (A) mode: Event counting on input A (B) during the duration of a pulse on input B (A).
Start/stop by B (A) mode: Event counting on input A (B) between two consecutive pulses on input B
(A).
Manual mode: Event counting is controlled by the START/STOP button. Sequential start-stop counts are accumulated.
RESET closes the gate and resets the Timer/Counter
to zero.
Volt Max/Min A
(Volt Max/Min B via GPIB only) Range: -51 V to +51 V
Frequency range:
DC and 100 Hz to 50 MHz
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