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HP4402.book : chapter2.fm 13 Fri Feb 12 15:32:45 1999
Power Meter Operation
Zeroing and Calibrating the Power Meter
HP E4419B User’s Guide 2-13
Zeroing and Calibrating Using TTL Inputs
You can use the TTL inputs on the rear panel Rmt I/O port to initiate zero
and calibration cycles on the power meter. The connector is an RJ-45
series shielded modular jack with the TTL input pins connected as shown
in Figure 2-3.
Figure 2-3: Rmt I/O Port TTL Inputs
The TTL inputs are active low and control the zero and calibration
functions as shown in Table 2-2
Table 2-2: TTL Inputs Control Logic
Input 1 Input 2 Operation
1 1 None
1 0 CAL A
0 1 ZERO BOTH
0 0 CAL B
Pin Number Connection
1 none
2 Ground
3 Upper Window TTL Output
4 Lower Window TTL Output
5 TTL Input 1
6 TTL Input 2
7 Ground
8 Ground
1 2 3 4 5 6 7 8