Boonton Electronics 71A, 71AR - Page 12

CAL 2: Calibration adjustment for low Q measurements.
For calibration procedures, see paragraph 3.10.
1000 pF ZERO: Zero adjustment for 1000 pF range. Once set
on initial installation, this control will rarely need re-
adjustment. However, since the setting of this control is
vital to proper operation for either capacitance or induc-
tance measurements, it is recommended that it be checked
periodically. (See paragraph 3.1.4, (f) & (g) for procedure.)
Line Voltage Compensation: Factory adjustment to assure
insensitivity to line voltage changes from 105 to 125 V, ac.
GND: Ground connection for dc bias input.
METER ON/OFF, Model 71A only): There is no interaction
between the indicating meter and the dc output except for
a small counter-emf from the moving coil of the meter move-
ment. With varying meter readings, this emf may show up
as slight irregularities in the dc output~ switching the
meter off eliminates this. NOTE: In the Model 71A.R this
function is performed by front panel switch #11. While
this swi~ch is present at the rear of the Model 71AR, it
is disabled.
2.5.3 Model 7lA
z
Left side~ Model 7lAR, Top
INTERNAL INDUCTANCE COMPENSATION: This factory adjustment
compensates for inductance of internal wiring. Pre-set at
the factory, this control does not require readjustment.
L ZERO:
This control provides a means for zeroing the in-
strument
on the 1 ~H range in accordance with the procedure
outlined in paragraph 3.13.
1000 WH CALIBRATION: This control provides means for in-
dividually calibrating the 1000 ~ range~ it is pre-set at
the factory and does not require readjustment.
Adjustments for the internal 100 pF standard capacitor.
These are set at the factory and do not require readjustment.
2-7
7lA
b