Other lab equipment
Tektronix CFG280 Function Generator and DM2510G Programmable Digital Multimeter
Measuring amplifier gain using DM2510G
Measuring gain by this multimeter is simple: Set dBV mode and measure amplifier input. Then press NULL, from this time instrument measures difference in dB. So move probes to amplifier output and read gain on display.
Simple amp. with TDA7233 |
Measuring gain in dB mode |
Check measured gain by scope and calculator
Gain measured by cope |
Calculated gain |
Tektronix P6022 current probes with type 134 amplifier
The P6022 is a 6 A AC Current Probe with termination provide versatile AC current measurements. It provide accurate current measurements over a wide range of frequencies. The probe allow current measurements without breaking the circuit by clipping onto the current carrying conductor. Shielded probe heads are not grounded when the slides are in their open positions, eliminating accidental grounding of the circuit under test. Passive termination output is switchable between 1 mA/mV and 10 mA/mV.
- 935 Hz to 120 MHz
- 4 A RMS, 100 A peak, 1 mA sensitivity
The P6022 has two sensitivity ranges. One is 1 mA/mV, where it works from 8.5 kHz to 1 Mhz.
The second is 10 mA/mV, where it works from 935 Hz to 120 MHz. More informations about it you can
read here
The Tektronix 134 current probe amplifier interfaces a P6019, P6020, P6021 or P6022 current probe to the voltage input of an oscilloscope. Specifications:
- Current range 1 mA/div to 1 A/div in 1-2-5 sequence (scope at 50 mV/div)
- Gain 50 or 125 (selectable)
- Bandwidth 8 Hz to 54 MHz @ Gain 50, 10 Hz to 30 MHz @ Gain 125
Measuring current with passive terminator
P6022 passive terminator |
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Passive terminator is set to 10 mA/mV, on scope is measured 27.8 mV so current is 278 mAp-p.
Measuring current with current probe amplifier
Current probe amplifier |
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Values on CURRENT/DIV knob on amplifier are valid for scope deflection factor 50 mV/div. When we use different factor, we must compute scaling factor, in our case: 0.1 V/div / 50 mV/div = 2.
Current probe amplifier is set to 20 mA/div, on scope I measured 6,98 div, so 20 * 6.98 * 2 = 279 mAp-p [mA/div, div, scaling factor].
