Tektronix 784A Manuel d'utilisateur télécharger pdf (Page 111)

Performance Tests

TDS 684A, TDS 744A, & TDS 784A Service Manual

4–35

Table 4–4: Analog Bandwidth

Vertical Scale

Attenuators

(10X)

Reference Amplitude (at

6 MHz)

Horizontal

Scale

TDS 684A

and 784A

Test

Frequency

TDS 744A

Test

Frequency

Limits

100 mV none 600 mV (6 divisions) 1 ns 1 GHz 500 MHz ≥424 mV

1 V none 5 V (5 divisions) 1 ns 1 GHz 500 MHz ≥3.535 V

500 mV none 3 V (6 divisions) 1 ns 1 GHz 500 MHz ≥2.121 V

200 mV none 1.2 V (6 divisions) 1 ns 1 GHz 500 MHz ≥848 mV

50 mV 1 300 mV (6 divisions) 1 ns 1 GHz 500 MHz ≥212 mV

20 mV 1 120 mV (6 divisions) 1 ns 1 GHz 500 MHz ≥84.8 mV

10 mV 1 60 mV (6 divisions) 1 ns 1 GHz 500 MHz ≥42.4 mV

5mV 2 30 mV (6 divisions) 1 ns 750 MHz 500 MHz ≥21.2 mV

2mV 2 12 mV (6 divisions) 1 ns 600 MHz 500 MHz ≥8.48 mV

1mV 2 6 mV (6 divisions) 1 ns 500 MHz 450 MHz ≥4.24 mV

e. Display the test signal: Do the following subparts to first display the

reference signal and then the test signal.

H Press MEASURE; then press the main-menu button Select

Measrmnt for CHx.

H Press the side-menu button more until the menu label Pk-Pk

appears in the side menu (its icon is shown at the left). Press the

side-menu button Pk-Pk.

H Repeatedly press the side-menu button –more– until Frequency

appears in the side menu (its icon is shown at the left). Press the

side-menu button Frequency.

H Press CLEAR MENU.

H Set the generator output so the CHx Pk-Pk readout equals the

reference amplitude in Table 4–4 that corresponds to the vertical

scale set in substep d.

H Press the front-panel button SET LEVEL TO 50% as necessary to

trigger a stable display. At full bandwidth, which for the TDS

684A/784A = 1 GHz and for the 744A = 500 MHz frequency, you

may also want to make small, manual adjustments to the trigger

level. You can use the TRIGGER LEVEL knob to do this.

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Tektronix 784A Manuel d'utilisateur Page 111

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