HP 3400B, User'S And Service Manual

Page: 38 / 77

Chapter 2 Calibration Procedures
Test Connector Pinout
Test Connector Pinout
Test connector
J3
gives you access to several test points on the main
circuit
board.
You can build your own custom ribbon cable interface if is
convenient for your application. The table below shows the pinout for
the test connector.
Refer /0 the schematics in chapter 7 for more detailed
informotion on the circuitry that interfaces with
the test
connector.
Test Connector J3
Pin Numb<lr Description
1 Kl01B. Rolay Drlvo Logic for Rolay Kl0l (low 1rue. ooe tho lable on page 45).
2 K201B. Rolay Drive Logic for Relay K201 (low true. saa thelable on page 45).
3 K202B. Rolay Drive Logic for Relay K202 (low true. ooe thelable on page 45).
4 K203B. Rolay Drlvo Logic for Relay K203 (low true. ooe the lable on page 45).
5 Ramolal1..ocal Con�ol. Ground or Hold Low to Disable Range Selector SWitch.
6 +VCC (4.7 kll Serlos Resistor).
7
CGND. Common Ground
8
+VBB
9
-VBB
1 0
-VRAW ( 1 0
kll
Sarles Rosistor). OU1pullrorn Powor Transformer (Tl).
1 1
NolUsod
12
OPAMP _DC. OU1pullrorn Widob<lnd Amplifier (U301).
1 3
DC_OUT.
Same
as
Rear Panel OU1pu1 (loading on this
llno will a_I
signal on
1 4
rear·panel ou1put loading on rear-panel output wUl aJIecI slgnaJ on this
Uno).
CGND. Common Ground
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