Monroe Electronics 244 ISOPROBE Electrostatic Voltmeter

The Monroe Electronics 244 ISOPROBE Electrostatic Voltmeter is a precision non-contact surface voltage measurement instrument engineered for laboratory and manufacturing environments. It delivers high accuracy and stability independent of probe-to-surface separation, enabling voltage characterization across wide process windows without physical contact.

– Technical Specifications

• Measurement Type: Non-contact surface voltage measurement
• Voltage Range: ±3000 V, auto polarity
• Accuracy: 0.1% (±0.003%/°C temperature coefficient, +20 to +40°C at recorder output)
• Operating Temperature: Main unit to +50°C; probe components -50°C to +80°C
• Settling Time: 300 Hz
• Surface Resolution: Standard probes (Type 1017AE/AS) resolve 0.10″ (2.5 mm) spot at 0.02″ (0.5 mm) separation; specialty high-resolution probes resolve spots as small as 1 mm
• Recorder Output: Compressed analog (HV/1000), maximum 3 V into ≥10 kΩ loads (Model 244AK: divide by 200 for >1 kΩ loads)
• Output Connector: BNC
• Output Filter: Bessel low-pass, 0.7 ms constant delay
• Power Input: 100/115/230 VAC ±10%, 50/60 Hz
• Power Consumption: 15 W maximum
• Display: Four-digit LCD with auto-zero, auto-symmetry, auto-polarity

– Key Features

• Probe-to-surface separation performance largely independent of standoff distance
• Standard Type 1017AE (end-viewing) and 1017AS (side-viewing) probes measure 0.35″ × 0.35″ × 2.85″ with 0.8″ cable minimum bend radius
• Compact footprint: 10 × 21.8 × 35.6 cm (4 × 8.5 × 14 inches), 7 lb (3.2 kg)
• Rack-mountable configuration accommodates 1–2 units per 1.75″ rack space
• CE Mark compliant

– Typical Applications

Non-contact voltage measurement in surface analysis, contamination detection, and process control where physical contact measurement is undesirable or impractical.

– Compatibility & Integration

Operates with standard probes (1017AE/AS) and optional high-resolution or low-resolution probe variants. Analog recorder output via BNC connector suits integration with external data acquisition and control systems.