Fluke PM 6669, PM 6666 User Manual
®
PM 6666
Programmable Timer / Counter
PM 6669 Frequency Counter
Technical Data
•
Unrivaled price/performance
•
160 MHz / 1.3 GHz option
•
Reciprocal counting, 7 digits per second
•
High stability MTCXO: 2x10-7over 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
®
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 108s
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 /
109s
Period average measurement:
- 2.5 x 10-7x PERIOD / meas. time
Ratio A/B
(Ratio B/A, C/A or C/B via GPIB
only)
Range:
0 and 1 x 10-7to 2 x 109(A/B)
0 and 1 x 10-8to 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 / 10
9
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 108s (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 / 109s
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 1015with 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 / 10
9
(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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