5
HRRS 5kV and 10kV Series
Operation
Chapter 3
OPERATION
and a setting of 10-10-10-l0-10.10
W
becomes:
10
1 0 0 0 0 0.0
10
1 0 0 0 0.0
10
1 0 0 0.0
10
1 0 0.0
10
1 0.0
.10
1.0
TOT
1 1 1 1 1 1.0
3.3 Environmental Conditions
For optimal accuracy, the decade box should be used
in an environment of 23°C. It should be allowed to
stabilize at that temperature for 24 hours after any
signifi cant temperature variation.
Temperature coeffi
cients are listed and can be used
for temperatures other than 23°C.
Humidity should be maintained at <50% RH. This is
especially important if high resistances above 1 GΩ
are involved. Prolonged expose to high humidity
can cause electrical leakage. This leakage causes
the resistance to be lower than the calibrated value.
The -WT version utilizes a watertight case to mini-
mize eff ect of humidity when the case is closed. The
case should be kept closed when not in use.
3.1 Initial Inspection and Setup
This instrument was carefully inspected before ship-
ment. It should be in proper electrical and mechanical
order upon receipt.
An
OPERATING GUIDE
is attached to the case
of the instrument to provide ready reference to
specifi cations.
3.2 Dial Setting
Whenever the dials are used in positions 0-9, the
resulting resistance is read directly. Both the decimal
point and the steps are clearly marked on the panel.
For additional fl exibility and range, each decade
provides a “10” position setting. This “10” position
on any one decade equals the “1” position on the next
higher decade. It adds about 11% to the nominal total
decade resistance.
To determine the resistance obtained when one or
more “10” settings are used, simply add “1” to the
next higher decade. For example, a setting of 3-6-
10-0-10 Ω becomes:
3
3 0 0 0 0
6
6 0 0 0
10
1 0 0 0
0
0 0
10
1 0
TOT
3 7 0 1 0
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