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22
@ 10 mz our
®
TRIGG. LEVEL OUT
34) EXT STD 1 OR 10 MHz
35) GATE OPEN
26)
37)
Internal switches and connectors
38 ] INT.STD/EXT.STD
39) 10 MHz STD/1 MHz STD
40)
oO
2)
Provides
internal oscillator signal even
if external standard
frequency
is
used. Amplitude is 1 V;ms in 1 kQ and source impedance approx. 200 2, DC
coupled.
Provides trigger level of channel A. Amplitude is +3 V to —3 V as set with
front panel control LEVEL A. Impedance is 4 kQ.
Set level equals measured value independent of load.
Accepts external frequency standard. Internal switch of unit 4 can be set to
match counter to 1 MHz or 10 MHz standards. 10 MHz must be used if time
resolution better than 1 us is required. 100 kHz signal can be applied but
correct
position
of decimal
point must then
be calculated.
Impedance
is
1 kQ shunted by 50 pF, AC coupled. Sensitivity is 500 mV;,; and maximum
input voltage 12 Vins.
Provides signal when main gate is open. Can be used as a Z-modulation
signal in single period, single time interval and frequency burst operating
modes. Amplitude is approx.
+04 V when main gate is closed and approx.
+5 V when main gate is open.
Impedance is 200 Q. Delay from input A to GATE OPEN is about 50 ns.
Clamp for protective ground.
Fuse holder.
Figure VII-3
Sets counter to operate with internal or external clock oscillator.
Sets counter to accept 10 MHz or 1 MHz external clock frequency.
Input connector for 10 MHz
signal from optional oscillator PM 9680 A or
PM 9681.
Connector for optional remote control unit PM 9685.
Connector for optional BCD
output unit PM 9684 or digital to analogue
converter PM 9687.
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