Wiring Block Preparation - HP 3457A Service Manual

TO MULTIMETER
IH IL
Figure 2-1 2. HP 44492A Simplified Schematic
2-36. HP
4449219 Configuration. T h e t I P 4449% Recd Relay Mulliplexer Assembly can be configured f o r
ten 2-wire i n p i ~ t measurements. It can be used t o measure d c boltage, a c voltage, a c
+
d c voltage, sesistance,
frequency and pet iod. It cannot be used f o r 4-wit e ohms ot cusrenl measi~rements.
2-37. Figure 2-12 sliows a simplified schematic of the MP 44492A Reed Relay M ~ ~ l t i p l e x e r Assembly.
2-38. Wiring Block Preparation
a. Remove tlie Strain Relicf Plate f r o m tlie bottom of t l ~ e Strain Relief Housing (Figure 2-13, Step 1)
b. R e ~ i i o v e Ilie Wiring Bloch f r o m tlie Strain Relief Housing (Figure 2-13, Step 2).
c.
Strip
8 mni (5/16 in.) of insulation f r o m one end of cach \\:ire t o connected t o tlie Wiring Block.
d. Loosen the appropriate retaining screw, insert tlie strippccl end of tlie wire into tlie slot, and re-
tighten the retaining screw (I2igure 2-14).
e. Repent step "d" f o r each \vise t o be connected.
f. Connecl tlie Wising Block t o the Strain Relicf Housing.
g. Separate the wires into three equal bundles and route them Ihrougli the cutouts
in
the Stmin Relief
Housing (if there are only a f e w wires, route them a11 through tlie center cutout).
11. Secure tlie Strain Relief Plate t o the Strain Relief Housing. Tighten tlie screws ~ ~ t i t i l tlie plate is
snug against the wires. D o not ovcr-tighten.
i. Press the Wiring Bloch Assembly o n t o the Plug-111 Assembly connector and lighten the sct-ews a t
each end of the Strain Relief Iiousing.