CT3684/CT3685 Datasheet High Voltage Differential Probe 50 MHz / 700 V (CT3684) 50 MHz / 1400 V (CT3685) Overview: Differential probes allow safe, accurate measurement between two voltage points where neither point is referenced to ground. The CT3684 and CT3685 both offer 50 MHz bandwidth and can test up to 700 V (DC + AC peak) and 1400 V (DC + AC peak), respectively. Compatible with oscilloscopes from all major manufacturers, the probes are powered by the included 9 VDC adapter. Features: 50 MHz bandwidth (-3 dB) Up to 700 V (DC + AC peak) common mode (CT3684) Up to 1400 V (DC + AC peak) common mode (CT3685) Attenuation settings of 10x (CT3684) and 100x (CT3685) High accuracy (1%) High CMRR Power indicator LED 9 VDC adapter, CT3723 (included) USB power lead, CT4122 (optional) Battery pack with 4 AA batteries, CT3729 (optional) CT3684 shown Technical data subject to change. (c) Cal Test Electronics 2017. caltestelectronics.com Electrical Specifications CT3684 Bandwidth (-3dB) CT3685 50 MHz (driving 1 M oscilloscope input) Rise Time (10%-90%) 7 ns Attenuation ratio 10x 100x Accuracy 1% CMRR (typical) -90 dB @ 60 Hz -55 dB @ 1 MHz Maximum Differential Input Voltage (DC + AC peak) 70 V 700 V Maximum Common Mode Input Voltage (DC + AC peak) 700 V 1400 V Absolute Maximum Rated Input Voltage (each side to ground) 500 Vrms CAT I 1000 Vrms CAT II Input Impedance 1.6 M // 7 pF (each side to ground) 4.0 M // 7 pF (each side to ground) Output Voltage Swing 7 V (driving 1 M oscilloscope input) Offset (typical) 2 mV 1 mV Noise (typical) 0.7 mVrms 0.3 mVrms Source Impedance 50 k Power Supply CT3723 power adapter (included) or 4 AA batteries (optional) CT4122 USB power lead (optional) Mechanical Characteristics Weight 300 g Dimensions 111 x 22 x 14 mm BNC Cable Length 125 cm Input Leads Length 50 cm each Environmental Characteristics Operating Temp/Humidity -10C to 40C / Up to 85% RH Storage Temp/Humidity -30C to 70C / Up to 85% RH Pollution Degree Pollution Degree 2 Altitude Operating: 3,000 m Nonoperating: 15,300 m Safety Specifications IEC 61010-031 CAT I (CT3684) CATII (CT3685) Technical data subject to change. (c) Cal Test Electronics 2017. caltestelectronics.com