DC Voltage & Current Digital Panel Meters

High accuracy, high read rate, control outputs



  • ±0.2, ±2, ±20, ±200, ±300V & ±600V DC voltage ranges
  • ±2, ±20, ±200 mA and ±5A DC current ranges
  • 99.99% full scale accuracy ±2 counts
  • Front panel scalable to ±99,999 for use with current shunts
  • Transducer excitation output, 5, 10 or 24 Vdc (isolated)
  • Universal 85-264 Vac / 90-300 Vdc or 10-48 Vdc / 12-32 Vac power
  • Wide choice of options:
    - 2 or 4 relays, mechanical or solid state (isolated)
    - Analog output, 4-20 mA, 0-10V, or -10V to +10V (isolated)
    - Serial data I/O: Ethernet, USB, RS485, RS232 (isolated)
    - Custom curve linearization, rate from consecutive readings

DC voltage and current panel meters with a DC signal conditioner board combine high accuracy with high read rate and a wide range of isolated output options for computer interface and control. Accuracy is 99.99% of full scale ±2 counts.

  • DC voltmeter operation (selected by jumpers) provides and six full-scale voltage ranges from ±200.00 mV with 10 mV resolution to ±600.0V with 100 mV resolution. The 200.00 mV and 2.0000V ranges provide a high input impedance of 1 Gohm to minimize the load on the voltage signal.
  • DC ammeter operation (selected by jumpers) provides four full-scale current ranges from ±2.0000 mA with 0.1 mA resolution to ±5.000 A with 1 mA resolution. The 5.000 A range measures the IR drop across a built-in 10 milliohm current shunt.

All voltage and current ranges are factory calibrated, with calibration factors for each range stored in an EEPROM on the signal conditioner board. This allows ranges and signal conditioner boards to be changed in the field without recalibrating the meter.

Using a meter with a current shunt External current shunts are fully supported. Scaling from full-scale millivolts, such as 50 mV or 100 mV, to amperes is easily accomplished from the front panel of the meter. The scalable readout is five full digits up to ±99,999 counts.

Power High read rates at up to 60 or 50 conversions per second while integrating the signal over a full power cycle are provided by Concurrent Slope (US Pat 5,262,780) analog-to-digital conversion. High read rates are ideal for peak or valley capture, real-time computer interface, and control. Peak and valley values are automatically captured. These may be displayed via a front panel pushbutton command or a control signal at the rear connector, or be transmitted as serial data.

Digital filtering is selectable for electrically noisy environments, including a batch averaging filter and an adaptive moving average filter which provides a choice of 8 time constants from 80 ms to 9.6 s. When a significant change in signal level occurs, that filter adapts by briefly switching to the shortest time constant to follow the change, then reverts back to the selected time constant. In a selectable Auto filter mode, the filter time constant is automatically selected based on detected signal noise.

Designed for system use. Optional plug-in boards for communications and control include Ethernet and other serial communication boards, dual or quad relay boards, and an isolated analog output board. s may be powered from 85-264 Vac or optionally from 12-32 Vac or 10-48 Vdc. The display is available with red or green LEDs. The 1/8 DIN case meets NEMA 4X (IP65) specifications from the front when panel mounted. Any setup functions and front panel keys can be locked out for simplified usage and security. A built-in isolated 5, 10, or 24 Vdc excitation supply can power transducers and eliminate the need for an external power supply. All power and signal connections are via UL / VDE / CSA rated screw clamp plugs.


DC Voltage

DC Voltage Range Resolution Input Resistance Error at 25°C
±200.00 mV 10 µV 1 GΩ 0.01% FS ± 2 cts
±2.0000 V 100 µV 1 GΩ 0.01% FS ± 2 cts
±20.000 V 1 mV 10 MΩ 0.01% FS ± 2 cts
±200.00 V 10 mV 10 MΩ 0.01% FS ± 2 cts
±300.0 V 0.1 V 10 MΩ ± 0.4 V
±600.0 V* 0.1 V 10 MΩ ± 0.4 V
* Range ETL certified to 300.0 V only.

DC Current

DC Current Range Resolution Input Resistance Error at 25°C
±2.0000 mA 0.1 µA 100 Ω 0.01% FS ± 2 cts
±20.000 mA 1.0 µA 10 Ω 0.01% FS ± 2 cts
±200.00 mA 10 µA 1 Ω 0.01% FS ± 2 cts
±5.000 A 1 mA 0.01Ω ± 10 mA

DC Voltage & Current

Readout 5 LED digits, 7-segment, 14.2 mm (.56"), red or green.
Range -99999 to 99999 or -99990 to 99990 (count by 10)
Indicators Minus sign, 2 red LED lamps
A-to-D Conversion
Technique Concurrent Slope (Pat 5,262,780)
A-to-D rate 60/s at 60 Hz, 50/s at 50 Hz
Output update rate 56/s at 60 Hz, 47/s at 50 Hz
Display update rate 3.5/s at 60 Hz, 3/s at 50 Hz
Error at 25°C 0.01% FS ± 2 counts (except 5A range)
Span tempco 0.003% of reading/°C
Zero tempco 0.1 count/°C
Noise Rejection
CMR, DC to 60 Hz 130 dB
NMR at 50/60 Hz 90 dB with min filtering
Maximum Signal
Max applied voltage 600 Vac for 20, 200 and 300 V ranges, 125 Vac for other ranges
Current protection 25x for 2 mA, 8x for 20 mA, 2.5x for 200 mA, 1x for 5 A
Voltage, standard 85-264 Vac or 90-300 Vdc
Voltage, optional 12-32 Vac or 10-48 Vdc
Frequency DC or 47-63 Hz
Power  consumption (typical, base meter) 1.2W @ 120 Vac, 1.5W @ 240 Vac, 1.3W @ 10 Vdc, 1.4W @ 20 Vdc, 1.55W @ 30 Vdc, 1.8W @ 40 Vdc, 2.15W @ 48 Vdc
Power Isolation 250V rms working, 2.3 kV rms per 1 min test
Excitation Output (standard)
5 Vdc 5 Vdc ± 5%, 100 mA
10 Vdc 10 Vdc ± 5%, 120 mA
24 Vdc 24 Vdc ± 5%, 50 mA
Output Isolation 50 Vdc to meter ground
Analog Output (optional)
Output levels 4-20 mA, 0-20 mA, 0-10V, -10 to +10V (jumper selectable)
Current compliance 2 mA at 10V ( > 5 kΩ load)
Voltage compliance 12V at 20 mA (< 60Ω load)
Scaling Zero and full scale adjustable from -99999 to +99999
Resolution 16 bits (0.0015% of full scale)
Isolation 250V rms working, 2.3 kV rms per 1 min test
Relay Outputs (optional)
Relay types 2 Form C contact relays or 4 Form A contact relays (NO) 2 or 4 Form A, AC/DC solid state relays (NO)
Current tatings 8A at 250 Vac or 24 Vdc for contact relays 120 mA at 140 Vac or 180 Vdc for solid state relays
Output common Isolated commons for dual relays or each pair of quad relays
Isolation 250V rms working, 2.3 kV rms per 1 min tes
Serial Data I/O (optional)
Board selections RS232, RS485 (dual RJ11 or RJ45 connectors), USB, Ethernet, USB-to-RS485 converter, Ethernet-to-RS485 converter
Protocols Modbus RTU, Modbus ASCII, Modbus TCP (Ethernet), TDM ASCII
Data rates 300 to 19200 baud
Digital addresses 247 (Modbus), 31 (TDM ASCII),
Isolation 250V rms working, 2.3 kV rms per 1 min test
Signal Connections
DC panel meter signal connections
Operating temperature 0°C to 55°C
Storage temperature. -40°C to 85°C
Relative humidity 95% at 40°C, non-condensing
Protection NEMA-4X (IP-65) when panel mounted

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