Boonton 75D Instruction Manual page 65

Table 5. . Equipment Performance Checklist (Cont'd)
STEPS ITEM ACTION OR CONDITION PERFORMANCE STANDARD
9. Internal bias current
(Cont'd) check. i. Remove 10 kohm resistor i. None.
from TEST HI and LO
binding posts.
j. Remove multimeter prods j. None,
from telephone plug.
k. Remove telephone plug k. None,
from Model 75D.
l. Set DC BIAS switch to I. None.
EXT.
m„ Adjust multimeter to m„ None,
measure resistance on
lowest R setting.
n. Connect one multimeter n. Multimeter indicates
prod to DC BIAS 20 ohms + 20%.
EXTERNAL HI binding
post and connect the other
prod to TEST HI binding
post.
o. Remove jumper from DC o. None.
BIAS EXTERNAL LO and
ground binding posts.
p„ Remove test prod from DC p. Multimeter indicates
BIAS EXTERNAL HI 12 ohms ± 20%.
binding post and connect
it to DC BIAS EXTERNAL
LO binding post. Remove
test prod from TEST HI binding
post and connect it to TEST
LO binding post.
75D
b-370
60