Trigger Signal Specifications For The Time Marker Function; Trigger Signal Specifications For The Edge Function; Theory Of Operation; Voltage Mode - Fluke 5500A Service Manual

5500A
Service Manual

6-91. Trigger Signal Specifications for the Time Marker Function

Time Marker
Period
5 to 50 ms
20 ms to 100 ns
50 to 10 ns
5 to 2 ns

6-92. Trigger Signal Specifications for the Edge Function

Edge Signal
Frequency
1 kHz to 1 MHz

6-93. Theory of Operation

The following discussion provides a brief overview of the following SC300 operating
modes: voltage, edge, leveled sine wave, time marker and wave generator. This
discussion will allow you to identify which of the main plug-in boards of the Calibrator
Mainframe are defective. Figure 6-18 shows a block diagram of the SC300 Option, also
referred to as the A50 board. Functions that are not depicted in the figure are generated
from the DDS Assembly (A6 board). For a diagram of all Calibrator Mainframe board
assemblies, refer to Figure 2-1.

6-94. Voltage Mode

All signals for the voltage function are generated from the A6 board and are passed to
the A50 board via the SCOPE_HV signal line. The generated signal (ac or dc) is then
passed from the A50 board to the A90, attenuator assembly, where range attenuation
occurs. The signal is then passed to the SCOPE output BNC on the front panel.

6-95. Edge Mode

The edge clock originates on the A50 board. The signal is then shaped and split to
generate the fast edge and external trigger signals. The edge signal is passed from the
A50 board first to the attenuator assembly (where range attenuation occurs) and then to
the SCOPE connector BNC on the front panel. If turned on, the trigger is connected to
the Trig Out BNC on the front panel.

6-96. Leveled Sine Wave Mode

All of the leveled sine wave signals (from 50 kHz to 350 MHz) are produced on the A50
board. The leveled sine wave signal is passed from the A50 board to the on-board
attenuator assembly. The attenuator assembly provides range attenuation and also
contains a power detector which maintains amplitude flatness across the frequency
range. The signal is then passed to the SCOPE connector BNC on the front panel.

6-97. Time Marker Mode

There are several "ranges" of time marker operation: 5 s to 50 ms, 20 ms to 100 ns, 50 ns
to 20 ns, 10 ns and 5 to 2 ns.
6-72
Division Ratio [1]
off/1
off/1/10/100
off/10/100
off/100
Division Ratio
off/1
Amplitude into
50 Ω (p-p)
≥ 1 V
≥ 1 V
≥ 1 V
≥ 1 V
Amplitude into
Typical Rise Time
50 Ω (p-p)
≥ 1 V
Typical Rise Time
≤ 2 ns
≤ 2 ns
≤ 2 ns
≤ 2 ns
≤ 2 ns