7451A/7461A/7461P Digital Multimeter Operation Manual
6.5 Comparator Output
6-11
6.5
Comparator Output
The comparator calculation result is output from the comparator output terminal (COMPARATOR) on the
rear panel as the TTL signal and the optical semiconductor relay contact signal.
Specifications
Connector
D-Sub9 pin
a.
Optical semiconductor relay contact
Allowable contact voltage (for break)
DC30 V
Allowable contact current
DC120 mA
Withstand voltage between contact and GND
30 V
Contact operating time
1 ms or less
Contact output
LO: 4 pin and 8 pin
HI: 3 pin and 7 pin
PASS: 2 pin and 6 pin
b. TTL output
Output level
TTL
Maximum allowable applied voltage
12 V peak
Overload characteristics
Short-circuit (continuous)
Figure 6-3 Signal Output Pin
Pin name
Pin number
Signal GND
5
RELAY LO
4
RELAY HI
3
RELAY PASS
2
TTL PASS
1
3
2
5
4
1
8
7
9
6
Pin number
Pin name
9
TTL FAIL
8
RELAY LO
7
RELAY HI
6
RELAY PASS
