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
100mV none 600mV (6 divisions) 1 ns 1 GHz 500 MHz ≥424mV
1 V none 5 V (5 divisions) 1 ns 1 GHz 500 MHz ≥3.535 V
500mV none 3 V (6 divisions) 1 ns 1 GHz 500 MHz ≥2.121 V
200mV none 1.2V (6 divisions) 1 ns 1 GHz 500 MHz ≥848 mV
50mV 1 300 mV (6 divisions) 1 ns 1 GHz 500 MHz ≥212 mV
20mV 1 120 mV (6 divisions) 1 ns 1 GHz 500 MHz ≥84.8 mV
10mV 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 ≥4.24mV
e. Display the test signal: Do the following subparts to first display the
reference signal and then the test signal.
HPress MEASURE; then press the main-menu button Select
Measrmnt for CHx.
HPress 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.
HRepeatedly 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.
HPress CLEAR MENU.
HSet 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.
HPress 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.