4 1/2 DIGIT DC VOLTMETER IN 1/16 DIN CASE, 5 V DC POWERED

Model 2520 is an economical 5-volt powered, high-resolution, high-accuracy 4 1/2 digit DC voltmeter in a compact 1/16 DIN case. The height of the panel cutout is only 0.88 in (22.2 mm). The depth behind the panel is only 2.83 in (72 mm). Power consumption is 1 watt at 5 V dc.

Low cost, small size, low power consumption and exceptional power-supply noise rejection make the 2520 ideal for demanding OEM and portable-instrument applications. Non-isolated character-serial BCD output is standard to allow the 2520 to be interfaced to other instrumentation.

PARALLEL BCD OPTION F2M
The F2M option is an upper board which converts the meter's serial BCD output to non-isolated, three-state parallel BCD. An address decoder on the board permits the meter's parallel BCD outputs to be enabled by a 4-bit binary address signal for three-state data-busing applications.

Configuration: Bipolar, true-differential
Zero: Automatic

NOISE REJECTION
NMR: 60 dB at 50/60 Hz
CMR: 86dB, DC to 60 Hz
CMV: SIG LO to DIG GND ±1 Vp

ACCURACY AT 25°C
Maximum error: ±0.01% of reading ±2 counts
Span tempco, standard: (2 V) ±0.005% of reading/°C, (20/200 V) ±0.0025 of reading/°C
Span tempco, optional: (2 V) ±0.001% of reading/°C, (20/200 V) ±0.002% of reading/°C
Step response: 2 s
Warmup to rated accuracy: 0.5 hr

ANALOG-TO-DIGITAL CONVERSION
Technique: Dual-slope, average-value
Polarity: Automatic
Signal integration period: 100 ms
Read rate: 2.5/s

3-WIRE RATIO REFERENCE
Reference voltage: 0.5-3.0 V
Load on reference, std: 40 kohm
Load on reference, opt: 2.5/s

DISPLAY
Type: 7-segment, red LED
Height: 0.56 in (14.2 mm)
Symbols: 1.8.8.8.8
Decimal points: Four positions programmable internally or at connector
Overrange indication: Display flash

DIGITAL SIGNALS
Output signals: TTL-compatible
Hold Input: TTL or 5 V CMOS compatible
Blanking Input: Open-collector compatible

POWER
Voltage: 5 V dc ±5%
Current: 170 to 230 mA
Power consumption: 1 W (nominal)

ENVIRONMENTAL
Operating temperature: 0 to 55°C
Storage temperature: 40 to +85°C
Relative humidity: 95% at 40°C (non-condensing)

MECHANICAL
Dimensions: Newport DIN3 (1/8 DIN) case (see Mechanical section for drawings)
Weight: 5 oz (145 g)
Case material: 94V-0 UL-rated polycarbonate