Fluke 225C Service Manual - Page 45

4 Performance Verification 4.6 Scope Input A&B Tests UUT Model ALL 192B-C 196B-C, 215C 199B-C, 225C Table 4-10. Input B Trigger Sensitivity Test Points UUT Time base 5500A SC... MODE levsin Initial Input Voltage Frequency 200 ns/div 10 ns/div 10 ns/div 10 ns/div 10 ns/div 10 ns/div 10 ns/div 100 mV pp 400 mV pp 800 mV pp 400 mV pp 800 mV pp 400 mV pp 800 mV pp 5 MHz 60 MHz 100 MHz 100 MHz 150 MHz 200 MHz 250 MHz UUT Trigger Amplitude 0.5 div 1 div 2 div 1 div 2 div 1 div 2 div 4.6.12 Input B AC Voltage Accuracy (HF) & Bandwidth Test Proceed as follows to test the Input B high frequency automatic scope ac voltage measurement accuracy, and the bandwidth: 1. Connect the test tool to the 5500A as for the previous test (see Figure 4-7). 2. Select the following test tool setup: • Recall the created SETUP 1 (see section 4.4.3): press , RECALL , select SCREEN+SETUP 1 , press RECALL SETUP . • Press • Press , then press READING 2 , and select on B | V ac. to select autoranging (AUTO in upper right LCD edge) • Using and change the sensitivity range to select manual sensitivity ranging, and lock the Input B sensitivity range on 500 mV/div. 3. Set the 5500A to source a sine wave, to the first test point in Table 4-11. 4. Observe the Input B reading and check to see if it is within the range shown under the appropriate column of table 4-11. 5. Continue through the test points. 6. When you are finished, set the 5500A to Standby. UUT Model all all 192B-C 196B-C, 215C 199B-C, 225C Table 4-11. HF AC Voltage Verification Points 5500A SC... MODE levsin Voltage Frequency UUT Reading B 2.545 Vpp 2.545 Vpp 2.545 Vpp 2.545 Vpp 2.545 Vpp 1 MHz 25 MHz 60 MHz 100 MHz 200 MHz 835 mV to 965 mV 790 mV to 1.010 V >630 mV >630 mV >630 mV 4-21