DMR35-DCxA.A01.D04 Page 6 of 8

DMR35-DCxA Series

DMR35 DC Micro and Milli-ammeters

www.murata-ps.com

Display Intensity Settings

Set the display intensity by setting the switches as shown:

SW1 SW2

Dipswitch

Display Intensity

OFF

OFF

Low

OFF

ON

Medium

ON

OFF

High

ON

ON

High2 3

TECHNICAL NOTES

1.

Calibration

The DMR35 is calibrated at the factory at manufacture. There are no user or field-adjustable calibration features.

2.

Wiring

Power supply and input wiring must be rated for the electrical and environmental conditions under which the meter will be operated. They

must also comply with any regulatory or application-mandated requirements pertaining to the user’s installation. The terminal blocks can

accommodate wire gauges ranging from #14 to #24 AWG. Wiring Insulation should be stripped to 6mm (0.24”). All wires must be inserted

into the terminal block openings such that the screw terminal does not pinch any insulation. It is important to tighten all screw-terminals to

their torque specification, which may be found in the Specifications Table. Proper tightening will help ensure reliable operation. Applications

subject to vibration should use stranded wire. After final assembly, inspect all terminal block connections for shorts between adjacent

conductors; this step is especially important when using stranded wire.

3.

Protection and Fusing

DMR35 meters’ power supply leads (+VS, -VS) are protected against momentary overvoltage and reverse polarity conditions. Input terminals

+I_IN and –I_IN are protected against noise and brief transients. Protection, however, is not provided against sustained conditions exceeding

the limits listed in in the Performance & Functional Specifications Table. External fusing must be supplied by the user in accordance to

applicable safety and regulatory requirements for the system in which the DMR35 is installed.

4.

Noisy Power Supplies

Some power supplies contain high-frequency switching devices that may conduct and/or radiate significant noise onto the low-level signal

developed across the measurement inputs. Even though the DMR35 incorporates built-in input filtering, some portion of this noise may be

amplified and subsequently measured by its sensitive input circuitry. Limiting runs of wire to less than 3 meters (10 feet) is strongly

recommended. Also, in systems with noisy power supplies, connecting an external, non-polarized capacitor across the +VS and -VS inputs

can help reduce measurement errors. In certain situations, the use of twisted pair or shield wiring may be required.

5.

Self-Diagnostics

On power-on the meter performs a self-test and checks the integrity of calibration data stored in internal non-volatile memory. If the factory

calibration data has been corrupted, the meter will display ‘CAL’ on power-on and approximately once a minute thereafter to indicate that the

meter is relying on default calibration factors and that displayed measurements may have more than the datasheet-specified amount of error.

If the meter detects other internal fault conditions, it will attempt to reset itself. Repeated restarts, which appear in the form of a highly

intermittent display, are indicative of a hardware fault that cannot be cleared through a reset operation, in which case the meter should no

longer be used.

3

Provides only slightly higher intensity than ‘High’ setting