7
HRRS Series
7
Maintenance
4.3.3 Calibration Procedure
To calibrate the HRRS unit, proceed as follows
1. Confirm that the leakage resistance between
either binding post and the case ground is
>10
6
times the highest unit resistance, but
may be as low at 1 TΩ.
If this is not obtained, clean the area
around the binding posts as described in
Section 4.2.
2. Confirm the zero resistance of the unit.
3. Determine the allowable upper and lower
limits for each resistance setting of each
decade based on the specified accuracy (See
Specifications on Page 2).
4. Confirm that the resistances fall within these
limits after subtraction of the zero resistance.
If any resistances fall outside thee limits,
the associated switch assembly may
require service or replacement.
WARNING
Connect the G (GND) terminal to
earth or other suitable ground in
order to maintain the case at a safe
voltage.
Whenever hazardous voltag e s
(>45 v) are used, take all measures to
avoid accidental contact with any live
components.
U s e m a x i m u m i n s u l a t i o n a n d
minimize the use of bare conductors.
REMOVE POWER WHEN ADJUSTING
SWITCHES.
Po s t w a r n i n g s i g n s a n d k e e p
personnel safely away.
4.4 Schematic
Refer to Figure 4-1 for a schematic of the HRRS unit.
Figure 4-1: HRRS Series Schematic Diagram
