Tektronix TLA 720, Service Manual

Page: 48 / 214

Reference
TLA 720 Benchtop Chassis and TLA 7XM Expansion Chassis Service Manual
2–9
Table 2–1: Passive monitor connector pinouts
Pin Function Description
1 +5 VM +5 V for voltage monitoring
To monitor, only use a probe with greater than 1 M
W
impedance.
2 –12 VM –12 V for voltage monitoring
To monitor, only use a probe with greater than 1 M
W
impedance.
3 –24 VM –24 V for voltage monitoring
To monitor, only use a probe with greater than 1 M
W
impedance.
4 –2 VM –2 V for voltage monitoring
To monitor, only use a probe with greater than 1 M
W
impedance.
5 ON/ST Remote On/Standby Power Switch.
1
6 +5 VC +5 V output for charging batteries, running external TTL circuitry,
1 A maximum
7 +12 VC +12 V output for charging batteries, running external TTL circuitry,
1 A maximum
8 +5 VB Input for +5 V standby voltage (for example, from an external
battery). Maximum of 1 A total (pins 8 and 21 combined)
2
9 GND Logic Ground
10 SYSRESET* Backplane SYSRESET* signal (input or output). If you use this pin,
do not violate VXIbus electrical specifications (keep the extender
cable as short as possible).
11
∆
T An analog output signal proportional to the maximum temperature
rise of the 13 modules (100 mV/
°
C) 0V=0
°
C
12 TACH1 A square wave output signal whose period is proporitinal to the
speed of fan number 1
13 TACH2 A square wave output signal whose period is proporitinal to the
speed of fan number 2 when a second fan is used. In the current
mainframe only a single fan is used.
14 +12 VM +12 V for voltage monitoring
To monitor, only use a probe with greater than 1 M
W
impedance.
15 +24 VM +24 V for voltage monitoring
To monitor, only use a probe with greater than 1 M
W
impedance.
16 –5.2 VM –5.2 V for voltage monitoring
To monitor, only use a probe with greater than 1 M
W
impedance.
17 GND Logic Ground
18 GND Logic Ground
19 GND Logic Ground
20 GND Logic Ground