Owner's manual

4
SPECIFICATION
CONSULT INSTRUCTION MANUAL FOR PROPER INSTRUMENT OPERATION
DBX SERIES HIGH ACCURACY DECADE BOX
Temperature Coefficient: <±50 ppm/°C for 1 mΩ steps;
<±20 ppm/°C for 10 mΩ through 1 Ω steps;
<±15 ppm/°C for 10 Ω steps;
<±5 ppm/°C for 100 Ω through 100 kΩ steps;
<±10 ppm/°C for 1 MΩ and 10 MΩ steps.
Switch Type: Multiple solid silver alloy contacts.
Switch Capacitance: Less than 4 pF per switch, low loss.
Operation: If switches have not been operated for an
extended period, they should be rotated a
few times to restore contact resistance to
specifications.
Resistor Type: Resistance wire for 0.1 Ω steps and under;
wirewound, noninductive for 1 Ω through 1 MΩ steps;
resistance film for 10 MΩ steps.
Accuracy: ±(0.01% + 2 mΩ) after subtraction of zero resistance,
at 23°C; traceable to NIST.
Zero Resistance: ≤1 mΩ per decade, typical at dc.
Power per Step: 25 mW for 1 mΩ steps;
0.2 W for 10 mΩ steps;
0.25 W for 100 mΩ steps;
0.6 W for 1 Ω through 100 Ω steps;
0.5 W for 1 kΩ through 1 MΩ steps;
0.1 W for 10 MΩ steps;
subject to a maximum of 2000 V.
WARNING
MODEL: DBX-7-0.1
Figure 2.1. Typical Operating Guide Affixed to Unit
Observe all safety rules when working with high voltages or line voltages. Connect the (G) terminal to earth ground in order to maintain the case at
a safe voltage. Whenever hazardous voltages (>45 V) are used, take all measures to avoid accidental contact with any live components: a) Use maximum
insulation and minimize the use of bare conductors. b) Remove power when adjusting switches. c) Post warning signs and keep personnel safely away.
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