Fluke 5700A Series User Manual

Theory of Operation
Analog Section Detailed Circuit Description 2
2-41
U5 with heat sink, bypass capacitors C10 and C28, and protection diodes CR9, CR10,
and CR12. Resistors R4 and R8 set the output voltage in the same manner as the +44S
supply. Capacitor C12 improves ripple rejection. Diodes CR9 and CR10 protect U5
against input shorts, while CR12 protects against reverse voltage.
2-77. Guarded Digital Control Circuitry
The Inguard CPU controls all the analog assemblies. It communicates with the
Unguarded CPU assembly (A20) through a serial fiber-optic link. The Inguard CPU is a
Hitachi 637A01Y0 CMOS microcontroller (U56) with 16K x 8 bit (16 KB, or 16
kilobyte) internal CMOS EPROM. Support circuitry includes 8K x 8 bits (8 KB) of
external CMOS static RAM, watchdog timer circuitry, reset and power glitch detect
circuitry, test switches, a serial fiber-optic link to the unguarded CPU, and decoders and
buffers to interface to the guarded digital bus. The assembly also generates an 8 MHz
sine wave for use by some of the analog assemblies.
2-78. Inguard CPU Memory Map
Table 2-11 shows the memory map of the Inguard processor.
Table 2-11. Inguard CPU Memory Map
Address Space (Hex) Name Use
0000 - 0027 Internal Registers on the 6301
0028 - 003F Unused memory space
0040 - 013F Internal RAM 256 Bytes
0140 - 3FFF CS0* Unused memory space
4000 - 4007 CS1* Wideband Output (A5)
4008 - 400F CS2* Current/Hi-Res (A7)
4010 - 4017 CS3* Switch Matrix (A8)
4018 - 401F CS4* Ohms Cal (A9)
4020 - 4027 CS5* Unused
4028 - 402F CS6 DAC (A11)
4030 - 4037 CS7* DAC (A11)
4038 - 403F CS8* Current/Hi-Res (A7)
4040 - 4047 CS9* Oscillator Control (A12)
4048 - 404F CS10* Oscillator Output (A13)
4050 - 4057 CS11* High Voltage Control (A14)
4058 - 405F CS12* Power Amplifier (A16)
4060 - 4067 CS13* Rear Panel (A21) Boost
4068 - 406F CS14* Current/Hi-Res (A7)
4070 - 4077 CS15* Wideband Oscillator (A6) Unused
4078 - 407F Unused
4080 - 5FFF Unused(memory overlay of 4000-407F)
6000 - 9FFF Unused
A000 - BFFF External RAM
C000 - FFFF Internal ROM or EPROM
2-79. Inguard Memory Configuration
The microcontroller (U56) has 16 KB (kilobytes) of internal EPROM program memory.
IC U62 provides 8 KB of external static CMOS RAM, with a jumper option for a plug-in
replacement with a 2 KB device.

Fluke 5700A Series Specifications

General

Type	Multifunction Calibrator
Operating Temperature	0°C to 50°C
Storage Temperature	-40°C to 70°C
Humidity	10% to 90% non-condensing
Frequency Range	10 Hz to 1 MHz
Accuracy	Varies by function and range. See manufacturer's specifications for details.
Output Stability	Varies by function and range. See manufacturer's specifications for details.
Power Requirements	50 Hz to 60 Hz