Model 205-A - 3 1/2 Digit Mini-size DC Voltmeter

3 1/2 DIGIT MINI-SIZE DC VOLTMETER
MODEL 205-A - MODEL 205 SERIES

3/64 DIN Case

Connections Diagram

STANDARD FEATURES
Miniature DIN case with 24 x 72 mm bezel
Full-size, 0.56 in (14.2 mm) LED display
±1,999-count display span
True-differential input
3-wire ratio input
120 dB CMR, 56 dB NMR
EMI/RFI power filter
Removable screw-clamp cable connector
Automatic zero and polarity
Display hold

OPTIONS
±200 mV to ±200 V dc ranges
Red or green LED display
24, 100, 115 or 230 V ac power
Non-isolated 5 or 7-32 V dc power
25 x 75 mm bezel adaptor

Model 205-A is a low-cost 3 1/2 digit DC voltmeter with a full-size 0.56 in (14.2 mm), red or green LED display, yet housed in a small 3/64 DIN case with a 24 x 72 mm bezel. The case fits into a standard 3/64 DIN cutout, 0.87 x 2.68 in (22.2 x 68 mm), and requires a depth of less than 4.72 in (120 mm) behind the panel, including plug-in screw-clamp connectors (standard).

The 205-A offers 99.9% accuracy and jumper-selectable DC voltage ranges of ±199.9 mV, ±1.999 V, ±19.99 V and ±199.9 V. The input is true differential, with excellent com-mon mode rejection (CMR).

AC- or DC-POWERED
Multiple choices are available for AC or DC power. All provide EMI filtering, so that power line noise does not affect the meter reading. AC power options are 24, 100, 115 or 230 V ac. Non-isolated DC power options are 5 or 7-32 V dc.

DESIGNED FOR SAFETY
Many design features are incorporated to ensure compli-ance with the latest worldwide safety specifications. To minimize the possibility of electrical shock, there are no openings which would allow electrical contact with a probe 0.16 in (4 mm) in diameter. Proper creepage distances are observed for power and signal as specified by IEC-348, Class 1. The power transformer uses separate bobbins for the primary and secondary windings. Type-Y AC line filter capacitors and removable screw-clamp connectors comply with VDE and UL specifications. Noryl SE-1 plastic is used in the case for mechanical strength and flame retardance.

SPECIFICATIONS

ANAOLG INPUT

Range	±199.9 mV	±1.999 V	±19.99 V	±199.9 V
Resolution	100 µV	1 mV	10 mV	100 mV
Maximum Input	130 Vp	250 Vp	250 Vp	250 Vp
Input Resistance	1 Gohm	1.1 M	1.0 Mohm	1.0 Mohm
Bias Current	50 pA	5 pA	1 pA	1 pA

Configuration: Differential, Bipolar
Zero: Automatic
Span Adjustment: ±5%

NOISE REJECTION
NMR: 56 dB, 50/60 Hz
CMR, SIG LO to PWR GND: 120 dB, DC to 60 Hz
CMV, SIG LO to PWR GND: 1500 Vp per HV test, 354 Vp per IEC spacing
CMV, SIG LO to DIG GND: 0 V

ACCURACY AT 25°C
Maximum error: ±0.05% of reading ±1 count
Span tempco: ±0.01% of reading/°C
Step response: 1 s
Warmup to rated accuracy: 30 min

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

DISPLAY
Type: 7-segment, red LED
Color: Red or green
Height: 0.56 in (14.2 mm)
Symbols: 1.8.8.8
Decimal points: Three position jumper-selectable behind lens
Overrange indication: Three least-significant digits blank

POWER OPTIONS
AC voltage: 24, 100, 115, 230 V ac ±15%
AC frequency: 49-63 Hz
DC voltage (non-isolted): 5 V dc ±5%, 7-32 V dc
Power consumption, AC or DC: 1.5 W

ENVIRONMENTAL
Operating temperature: 0 to 60°C
Storage temperature: 40 to 85°C
Relative humidity: 95% at 40°C (non-condensing)

MECHANICAL
Dimensions: Newport DIN2472-100 (3/64 DIN) (see Mechanical section for drawings)
Bezel (standard): 0.94 x 2.83 in (24 x 72 mm)
Bezel (with TP2 adapter): 0.98 x 2.96 in (25 x 75 mm)
Panel cutout: 0.87 x 2.68 in (22.2 x 68 mm)
Depth behind bezel (with connector): 4.72 in (120 mm)
Weight: 7 oz (200 g)
Case material: 94V-1 UL-rated Noryl SE-1