5
HRRS Series
5
Operation
Chapter 3
OPERATION
and a setting of 10-10-10-l0-10.10
Ω
becomes:
1 0
1 0 0 0 0 0 . 0
1 0
1 0 0 0 0 . 0
1 0
1 0 0 0 . 0
1 0
1 0 0 . 0
1 0
1 0 . 0
. 1 0
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 after any significant
temperature variation.
Humidity should be maintained at <50% RH. This is
especially important if high resistances are involved.
3.4 Storage
If this instrument is to be stored for any lengthy period
of time, it should be sealed in plastic and stored in a
dry location. It should not be subjected to temperature
extremes beyond the specifications. Extended expo-
sure to such temperatures can result in an irreversible
change in resistance, and require recalibration.
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
specifications.
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 flexibility 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
1 0
1 0 0 0
0
0 0
1 0
1 0
TOT
3 7 0 1 0
