Motorola S1051C

The Motorola S1051C is a portable, battery-operated transistorized AC voltmeter engineered for precision measurements across audio and RF applications. This fully transistorized instrument delivers high-gain signal amplification with low output impedance, making it suitable for low-level signal detection and AC voltage characterization in laboratory and field environments. The S1051C measures AC voltages from 0.1 mV to 300 V and provides power measurements from −72 dB to +52 dBm across 600 ohm impedance, with frequency response spanning 20 cps to 1 Mc.

– Technical Specifications

• Type: Transistorized AC voltmeter, battery-operated
• AC Voltage Measurement Range: 0.1 mV to 300 V
• Power Measurement Range: −72 dB to +52 dBm (600 ohm impedance)
• Comparative Power Measurement Range: −72 dB to +52 dB (600 ohm impedance)
• Frequency Response: 20 cps to 1 Mc
• Accuracy: ±2% of full scale (50 cps to 300 kc); ±3% of full scale (20 cps to 50 cps and 300 kc to 1 Mc)
• Flat Response: ±0.5 dB from 20 cps to 100 kc; approximately 3 dB down at 1 Mc
• Distortion: <1% with 1K ohm or greater resistive load shunted by ≤200 pF (20 cps to 20 kc, 20–30°C)
• Input Impedance: High
• Output Impedance: Low
• Amplifier Gain (400 cps): 500 (54 dB) on 1 mV range
• Output Voltage (400 cps): 1.4 V peak-to-peak or 0.5 V rms into 600 ohm or greater load
• Dimensions: 10.25" × 6.5" × 5.75"
• Weight: 6 lb 7 oz

– Key Features

• Fully transistorized design enables portable operation with minimal size and weight
• High-gain isolation amplifier for low-level signal conditioning
• Wide frequency coverage from audio through RF bands
• Dual measurement modes: absolute voltage and power level (dBm)

– Typical Applications

• AC voltage characterization in electronic circuits
• Power level monitoring across 600 ohm systems
• Low-level signal amplification and detection
• Field measurements in industrial and laboratory settings

– Compatibility & Integration

Battery power source enables operation independent of AC mains. Optional AC power supply available with S1053C variant.