Philips PM 6670 Operating Manual page 3

1. Technical Specification
Measuring modes
Frequency
Range: 0,1 Hz...120MHz (PM 6670, 6671).
0.1 Hz...1GHz(PM 6672).
Mode: Input-signal synchronized, high
resolution computing measuring method
(reciprocal).
Signal mode: ON. SINGLE BURST, MUL
TIPLE BURST FREQUENCY AVERAGE.
In the FREQUENCY AVERAGE mode
(rear panel selectable), the counter
measures the average of a multiple of
frequency samples. Samples are taken
with external gate control (s^soons) and
totalized during the selected measuring
time (10ms...96s) to allow multiple burst
frequency measurements or to sample
frequency sweep profiles.
LSD displayed: 10"'Hz. . .10^Hz(PM 6670,
6671). 10-'Hz...10<Hz(PM 6672), de
pending on measuring time and input
frequency. At least 7 digits displayed
per second of measuring time.
Resolution: LSD*.
Inaccuracy (rel.error):
. resolution . trigger* error
: rel
FREQ
base error.
measuring time
. time
Period average
Range: 100ns...100s
LSD displayed: 10"'^.. .10"®s, depending
on measuring time and period duration.
At least 7 digits displayed per second of
measuring time.
Resolution: LSD*.
Inaccuracy (rel.error):
. resolution trigger* error
: rel
PERIQD
base error.
measuring time
Time Interval A to B ; single
Range: 100ns...10®s.
LSD displayed: 10''s. . .10°s.
Resolution: LSD*.
Inaccuracy (rei.error):
± resolution ± trigger* error
± rel
TIME INT
base error.
. time
Pulse width A
Pulse width measurements are similar to
single time interval measurements. Both
start and stop triggering take place in
channel A, with common trigger level
setting and automatic trailing edge trigger
slope inversion with respect to selected
leading edge trigger slope.
All other specifications are identical to
single time interval. High resolution, pulse-
width measurements on narrow pulses
can be made in the time interval average
mode with manual selection of common
source and stop slope polarity.
Time Interval A to B; average
Range: 0ns...100s.
LSD displayed: 10''^s . . .10"®s, depending on
measuring time and time interval.
Resolution:
10-'s
VTJ
Inaccuracy (rei.error):
4 ns ± resolution trigger* error
TIME INT VTJx TIME INT
± rel. time base error.
Number of Intervals averaged (N):
Measuring time x interval repetition rate.
Minimum dead time from stop to start:
300 ns.
Note: Input signal must be repetitive and
asynchronous with respect to the time
base.
' or, 1 LSD unit, whichever is greather.
. time
Count A
Totalize range; 1. .10", with indication of
M-pulses and G-pulses beyond the 10®
display range.
Pulse pair resolution: 80 ns.
Mode:
Manual: Start-stop by DISPL. HOLD push
button. Sequential start-stop periods are
accumulated or individually totalized after
reset.
External: Totalizing interval controlled via
input B, selectable: count A gated during
pulse duration on B or count A gated
between start and stop pulse on B.
Inaccuracy: Pulse repetition rate A x
trigger* error B.
Phase A—B
Phase is the result of a simultaneous time
interval average and period average
measurement. The maximum phase range
is therefore limited, due to the 300 ns
dead time between stop and start of the
next time interval, and consequently
frequency dependent. For phase measure
ments between 180° and 360° on high
frequency signals, it is recommended to
measure the complementary phase
0°... 180° by changing the input leads
(phase B to A).
Phase range: 0.1°. . .360°x
|1-(300nsx FREQ)1 ,
Example 0.1°. . . 359.995° at 50 Hz
0.1°. . 357.3° at 25 kHz
0.1°... 180° at 1.666 MHz
Frequency range: 0.03Hz. . . 1.6 MHz
LSD displayed: 10"® . 10'^ degrees, de
pending on measuring time and phase
difference.
„ . .. 10-'sx FREQ X 360°
Resolution: -=
VTT
Inaccuracy (rei.error):
^ 4 ns X 360° x FREQ ^ resolution
PHASE ~ PHASE
trigger* error x FREQ x 360°
Vrpx PHASE
Number of Input cycles averaged (N):
Measuring time x FREQ A.
Minimum Input signal: 100 mVfmg.
Phase jitter tolerance: The tolerated phase
jitter peak-value ?£ phase difference, i. e.
phase jitter around 0° should not cause
consecutive measurement results of slight
ly above 0° and slightly below 360?, since
the toltal measurement result is the statisti
cal average of all individual results.
Ratio
Range:
FREQA 0...10MHz
(all models)
FREQ B 0...10MHz
LSD displayed: 10"'... 10°
Resolution: LSD*.
Inaccuracy (rei.error):
, resolution ^ .
RATIO trigger* error B..
Note: Frequency ratio measurements
FREQ A (or C)*_ 0.01 Hz.. .120 MHz (orl GHy)
FREQD 50kHz...10MHz
can also be made in the frequency mode,
by making use of the external reference
input D. However, this arrangement does
not give correct decimal points.
** Conly on PM 6672.
RPM
The RPM (revolutions per minute) mode
is similar to the frequency mode. The
measured frequency is multiplied x 60,
before being displayed.
Range: 0.6 RPM...10°RPM (with one pulse
per revolution).
LSD displayed: 10"' RPM . . . 10° RPM, de
pending on measuring time and RPM.
Resolution: LSD*
Inaccuracy (rei.error):
resolution trigger* error
± rel
RPM
base error.
measuring time
. time
' see definitions.